Eagle SeaFinder 640C DF User manual

Pub. 988-0143-861

www.eaglesonar.com

Fish-Finding & Depth-Sounding Sonars

Installation and Operation

Instructions

Eagle

®

, FishMark

®

and SeaFinder

®

are registered trademarks of LEI

No part of this manual may be copied, reproduced, republished,

transmitted or distributed for any purpose, without prior written

consent of Eagle Electronics. Any unauthorized commercial

distribution of this manual is strictly prohibited.

Eagle Electronics may find it necessary to change or end our policies,

regulations, and special offers at any time. We reserve the right to do so

without notice. All features and specifications subject to change without

notice. All screens in this manual are simulated. On the cover:

SeaFinder

®

640c DF shown. Other models covered in the manual are

similar.

For free owner's manuals and the most current information on

this product, its operation and accessories,

visit our web site:

www.eaglesonar.com

Eagle Electronics

P.O. Box 669

Catoosa, OK USA 74015

Printed in USA.

i

Table of Contents

Read Me First!...................................................................................1

Capabilities and Specifications: FishMark

®

640c ..............................2

SeaFinder

®

640c DF.............................................................................2

How Sonar Works ................................................................................4

How to Use this Manual: Typographical Conventions.......................5

Arrow Keys.......................................................................................5

Keyboard ..........................................................................................5

Menu Commands .............................................................................5

Instructions = Menu Sequences ......................................................5

Section 2: Installation & Accessories...........................................7

Preparations.........................................................................................7

Transducer Installation.......................................................................7

Recommended Tools and Supplies ..................................................8

Selecting a Transducer Location.....................................................9

How low should you go?.................................................................10

Shoot-Thru-Hull vs. Transom Mounting ......................................11

Transom Transducer Assembly and Mounting ............................12

Trolling Motor Bracket Installation (single-frequency only) .......19

Transducer Orientation and Fish Arches .....................................20

Shoot-Thru-Hull Preparation........................................................21

Testing Determines Best Location................................................22

Shoot-Thru-Hull Installation ........................................................24

Speed/Temperature Sensors..............................................................26

Optional Speed Sensor Installation ..................................................27

Power Connections.............................................................................29

Mounting the Unit: Bracket, In-Dash or Portable .......................31

Bracket Installation.......................................................................32

In-Dash Installation ......................................................................34

Portable Installation......................................................................34

Basic Sonar Operation ..................................................................37

Keyboard ............................................................................................37

Power/lights on and off ......................................................................38

ii

Main Menu .........................................................................................39

Pages ..................................................................................................40

Basic Sonar Quick Reference ......................................................45

Sonar Operations ...............................................................................46

Fish Symbols vs. Full Sonar Chart ...............................................50

Other Free Training Aids ..............................................................50

Section 4: Sonar Options & Other Features.............................52

ASP (Advanced Signal Processing)................................................53

To change the ASP level ................................................................54

Alarms ................................................................................................54

Depth Alarms .................................................................................55

Zone Alarm .....................................................................................56

Fish Alarm......................................................................................57

Backlight and Contrast Level ...........................................................58

Calibrate Speed..................................................................................59

Chart Speed........................................................................................60

ColorLine.........................................................................................61

Depth Cursor......................................................................................62

Depth Range - Automatic ..................................................................63

Depth Range - Manual ......................................................................64

FasTrack .........................................................................................65

Fish I.D. (Fish Symbols & Depths) ................................................65

To turn the Fish I.D. feature on ....................................................67

FishTrack ........................................................................................67

To turn on FishTrack.....................................................................67

Frequency (Change Transducer Frequency) (SeaFinder only)........68

To change the frequency setting to 50 kHz ..................................69

To change the frequency setting to 200 kHz ................................69

HyperScroll .....................................................................................69

Noise Rejection...................................................................................69

Overlay Data ......................................................................................69

Ping Speed & HyperScroll..............................................................72

To change Ping Speed ....................................................................73

To adjust Sensitivity......................................................................73

iii

To turn off HyperScroll..................................................................74

Pop-up Help........................................................................................74

Reset Options .....................................................................................75

Reset Water Distance ........................................................................76

Set Keel Offset ...................................................................................76

Sensitivity & Auto Sensitivity...........................................................78

Automatic Sensitivity ....................................................................78

To turn Auto Sensitivity back on ..................................................79

Set Language .....................................................................................80

Software Version Information...........................................................80

Sonar Chart Mode..............................................................................80

To change the chart mode color scheme .......................................81

Sonar Page & Sonar Chart Display Options ....................................81

Full Sonar Chart ............................................................................81

Split Zoom Sonar Chart.................................................................82

Digital Data/Chart .........................................................................83

Sonar Simulator.................................................................................85

Stop Chart ..........................................................................................86

Surface Clarity...................................................................................87

To adjust the Surface Clarity level ...............................................87

Transparency .....................................................................................88

To adjust Menu Transparency level..............................................89

Units of Measure................................................................................89

Zoom & Zoom Bar ..............................................................................90

Zoom Pan............................................................................................91

Section 5: Troubleshooting ..........................................................92

Unit won't turn on..........................................................................93

Unit operates only in demo mode..................................................93

Unit freezes, locks up, or operates erratically ..............................93

Weak bottom echo, digital readings erratic, or no fish signals....94

No fish arches when the Fish I.D. feature is off:.........................95

Noise ...............................................................................................95

Section 6: Supplemental Material ..............................................97

iv

Notes

1

Section 1: Read Me First!

How this manual can get you out on the water, fast!

Welcome to the exciting world of digital sonar! We know you're anxious

to begin finding fish, but we have a favor to ask. Before you grab your

unit and begin installing it, please give us a moment or two to explain

how our manual can help you get the best performance from your com-

pact, wide-screen, fish finder.

First, we want to thank you for buying an Eagle sonar. Whether you're

a first time user or a professional fisherman, you'll discover that your

unit is easy to use, yet capable of handling demanding sonar tasks. You

won't find another sonar unit with this much power and this many fea-

tures for this price!

Our goal for this book is to get you on the water fast, with a minimum

of fuss. Like you, we'd rather spend more time boating or fishing and

less time reading the manual!

So, we designed our book so that you don't have to read the whole thing

from front to back for the information you want. At the start (or end) of

each segment, we'll tell you what content is coming up next. If it's a

concept you're already familiar with, we'll show you how and where to

skip ahead for the next important topic. We've also made it easy to look

up any tips you may need from time to time. Here's how:

The manual is organized into 6 sections. This first section is an intro-

duction to the sonar unit. It tells you the basics you need to know before

you can make the unit look below the surface to find some fish.

Section 2 will help you install your unit and the transducer. We'll also

tell you about some of the available accessories.

Section 3 covers Basic Sonar Operation. It will show you how easy it is

to run your sonar, right out of the box. This section features a one-page

Sonar Quick Reference. (If you've already jumped ahead and fig-

ured out how to install the unit yourself, and you just can't wait

2

any longer, turn to the Quick Reference on page 45 and head

for the water with your sonar unit!)

After you have gained some experience with your sonar, you'll want to

check out Section 4, which explains more advanced Sonar Options and

Other Features.

When you come to a sonar menu command you can look it up in the man-

ual by skimming over the table of contents, just flipping through Section 3

or scanning through the sonar options in Section 4.

If you're having difficulty with your sonar, you can find an answer to

the most common problems in Section 5, Sonar Troubleshooting.

Finally, in Section 6, we offer Supplemental Material, including a list of

warranty and customer service information.

Now, if you're into the fine details, glance over the next segment on speci-

fications to see just how much sonar power your unit contains. It's impor-

tant to us (and our power users), but, if you don't care how many watts of

power the unit has, skip ahead to important information on how sonar

works, on page 4.

Capabilities and Specifications: FishMark

®

640c,

SeaFinder

®

640c DF

General

Display:............................ 5.0" (12.7 cm) diagonal 256-color TFT LCD;

programmable to viewing preference.

Resolution:...................... 640V x 480H pixel resolution; 307,200 total

pixels

Backlighting:.................. Backlit screen and keypad with multiple

lighting levels for night use.

Input power:................... 10 to 15 volts DC.

Case size:......................... 5.4" H x 6.9" W x 3.4" D (13.8 x 17.6 x 8.6

cm); sealed and waterproof; suitable for

saltwater use.

3

Back-up memory: .......... Built-in memory stores sonar settings for

decades.

Languages:...................... 10; menu languages selectable by user.

Sonar

Frequency:...................... 50/200 kHz for SeaFinder 640c DF; 200

kHz for FishMark 640c.

Transducers: .................. A dual-frequency Skimmer



transducer with

built-in temperature sensor is packed with

the SeaFinder 640c DF. It has 35°/12° cone

angles. A single-frequency Skimmer trans-

ducer with built-in temperature sensor is

packed with the FishMark 640c. It has a

20° cone angle. Transducers operate at

speeds up to 70 mph (61 kts)

Watts: ............................... SeaFinder 640c DF: 4,000 watts peak-to-

peak/500 watts RMS. FishMark 640c: 1,500

watts peak-to-peak/100 watts RMS.

Sonar sounding

Depth capability:........... SeaFinder 640c DF: 1,500 feet (457 me-

ters). FishMark 640c: 800 feet (244 meters).

Actual capability depends on transducer con-

figuration and installation, bottom composi-

tion and water conditions. All sonar units

typically read deeper in fresh water than in

salt water.

Depth display:................ Continuous display .

Audible alarms: ............. Deep/shallow/fish/zone.

Automatic ranging:....... Yes, with instant screen updates.

Auto bottom track:........ Yes.

Zoom bottom track: ...... Yes.

Split-screen zoom:......... Yes.

4

Surface water temp: ..... Yes.

Speed/distance log: ....... Optional (requires optional speed sensor).

NOTICE!

The storage temperature range for your unit is from -4 degrees to

+167 degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Ex-

tended storage in temperatures higher or lower than specified will

damage the liquid crystal display in your unit. This type of damage

is not covered by the warranty. For more information contact the

factory's Customer Service Department. The phone numbers are

listed on the last page.

How Sonar Works

Sonar has been around since the 1940s, so if you already know how it

works, skip ahead to the next segment on the typographical conventions

used in this manual. But, if you have never owned a sonar fish finder,

this segment will explain the under water basics.

Sonar is an abbreviation for SOund NA

vigation and Ranging, a tech-

nology developed during World War II for tracking enemy submarines.

A sonar consists of a transmitter, transducer, receiver and display. In

simple terms, here's how it finds the bottom and the fish:

The transmitter emits an electrical impulse which the transducer con-

verts into a sound wave and sends into the water. The sound frequency

can't be heard by humans or fish. The sound wave strikes an object

(fish, structure, bottom) and bounces back to the transducer which con-

verts the sound back into an electrical signal.

The receiver amplifies this return signal, or echo, and sends it to the

display where an image of the object appears on the scrolling sonar

chart. The sonar's microprocessor calculates the time lapse between the

transmitted signal and echo return to determine the distance to the

object. The whole process repeats itself several times each second.

5

How to Use this Manual: Typographical Conventions

Many instructions are listed as numbered steps. The keypad and arrow

"keystrokes" appear as boldface type. So, if you're in a real hurry (or

just need a reminder), you can skim the instructions and pick out what

menu command to use by finding the boldface command text. The fol-

lowing paragraphs explain how to interpret the text formatting for

those commands and other instructions:

Arrow Keys

The arrow keys control a horizontal line depth cursor on the sonar

screen. The arrow keys also help you move around the menus so you

can execute different commands. They are represented by symbols like

these, which denote the down arrow key, the up arrow, the left arrow

and the right arrow: ↓ ↑ ← →.

Keyboard

The other keys perform a variety of functions. When the text refers to a

key to press, the key is shown in bold, sans serif type. For example, the

"Enter/Icons" key is shown as

ENT and the "Menu" key is shown as MENU.

Menu Commands

A menu command or a menu option will appear in small capital letters,

in a bold sans serif type like this:

DEPTH CURSOR. These indicate that you

are to select this command or option from a menu or take an action of

some kind with the menu item. Text that you may need to enter or file

names you need to select are show in italic type, such as data type.

Instructions = Menu Sequences

Most functions you perform with the sonar unit are described as a se-

quence of key strokes and selecting menu commands. We've written

them in a condensed manner for quick and easy reading.

6

For example, instructions for turning on the Fish ID feature would

look like this:

1. From the Sonar Page, press

MENU|↓ to SONAR FEATURES|ENT.

2. Press → or → ↓ to

FISH ID SYMBOLS|ENT|EXIT|EXIT.

Translated into complete English, step 1 above would mean: "Start on

the Sonar Page. Press the Menu key then repeatedly press (or press and

hold) the down arrow key to scroll down the menu and select (highlight)

the Sonar Features menu command. Then press the Enter key."

Step 2 would mean: "Press the right arrow key (for dual-frequency

units) or press the right arrow key followed by the down arrow key (for

single-frequency units) to select (highlight) the Fish ID symbols com-

mand. Next, press the Enter key, then press the Exit key twice."

7

Section 2: Installation & Accessories

Preparations

You can install the sonar system in some other order if you prefer, but

we recommend this installation sequence:

Caution:

You should read over this entire installation section before drill-

ing any holes in your vessel!

1. Determine the approximate location for the sonar unit, so you can

plan how and where to route the cables for the transducer and power.

This will help you make sure you have enough cable length for the de-

sired configuration.

2. Determine the approximate location for the transducer and its cable

route.

3. Determine the location of your battery or other power connection,

along with the power cable route.

4. Install the transducer and route the transducer cable to the sonar

unit.

5. Route the power cable from the unit's location to an appropriate

power source and connect it there.

6. Connect the transducer/power cable to the unit and mount the sonar

unit on the bracket.

Transducer Installation

These instructions will help you install your Skimmer



transducer on a

transom, on a trolling motor or inside a hull. These instructions cover

both single- and dual-frequency Skimmer transducers. Please read all

instructions before proceeding with any installation.

Your Skimmer transducer typically comes packaged with a one-piece

stainless steel bracket for mounting it to the transom of your boat. The

optional trolling motor mount uses a one-piece plastic bracket with an

8

adjustable strap. These are "kick-up" mounting brackets. They help

prevent damage if the transducer strikes an object while the boat is

moving. If the transducer does "kick-up" the bracket can easily be

pushed back into place without tools.

Read these instructions carefully before attempting the installation.

Determine which of the installation methods is right for your boat.

Remember, the transducer location and installation is the most

critical part of a sonar installation.

Recommended Tools and Supplies

If you prefer the option of routing the cable through the transom, you

will need a 5/8" drill bit. If you intend to install an additional speed or

temp sensor and route its cable through the same hole in the transom,

you will need a 1" (25.4 mm) drill bit to accommodate all the cables.

NOTE:

The following installation types also call for these recommended

tools and required supplies that you must provide (supplies listed

here are not included):

Single-frequency transom installations

Tools: two adjustable wrenches, drill, #29 (0.136") drill bit, flat-head

screwdriver. Supplies: none.

Dual-frequency transom installations

Tools: two adjustable wrenches, drill, #20 (0.161") drill bit, flat-head

screwdriver. Supplies: four, 1" long, #12 stainless steel slotted wood

screws.

Single-frequency trolling motor installations

Tools: two adjustable wrenches, flat-head screwdriver. Supplies: plastic

cable ties.

Shoot-through hull installations

Tools: these will vary depending on your hull's composition. Consult

your boat dealer or manufacturer. Other tools are a wooden craft stick

or similar tool for stirring and applying epoxy and a paper plate or

piece of cardboard to mix the epoxy on. Supplies: rubbing alcohol, 100

9

grit sandpaper, specially formulated epoxy adhesive available from LEI

(see ordering information on the inside portion of the back cover). A

sandwich hull also requires polyester resin.

Selecting a Transducer Location

1. The location must be in the water at all times, at all operating speeds.

2. The transducer must be placed in a location that has a smooth flow of

water at all times. If the transducer is not placed in a smooth flow of

water, interference caused by bubbles and turbulence will show on the

sonar's display in the form of random lines or dots whenever the boat is

moving.

NOTE:

Some aluminum boats with strakes or ribs on the outside of the

hull create large amounts of turbulence at high speed. These boats

typically have large outboard motors capable of propelling the boat

at speeds faster than 35 mph. Typically, a good transom location on

aluminum boats is between the ribs closest to the engine.

3. The transducer should be installed with its face pointing straight

down, if possible. For shoot-thru applications: Many popular fishing

boat hulls have a flat keel pad that offers a good mounting surface. On

vee hulls, try to place the transducer where the deadrise is 10° or less.

Left, vee pad hull; right, vee hull. A pod style transducer is shown here,

but the principle is the same for Skimmers inside a hull.

4. If the transducer is mounted on the transom, make sure it doesn't in-

terfere with the trailer or hauling of the boat. Also, don't mount it

closer than approximately one foot from the engine's lower unit. This

will prevent cavitation (bubble) interference with propeller operation.

Deadrise less than 10

°

Pad

Strakes

10

5. If possible, route the transducer cable away from other wiring on the

boat. Electrical noise from engine wiring, bilge pumps and aerators can

be displayed on the sonar's screen. Use caution when routing the trans-

ducer cable around these wires.

Good and poor transducer locations.

How low should you go?

For most situations, you should install your Skimmer transducer so

that its centerline is level with the bottom of the boat hull. This will

usually give you the best combination of smooth water flow and protec-

tion from bangs and bumps.

Align transducer centerline with hull bottom. A dual frequency trans-

ducer is shown at left and a single frequency transducer at right.

CAUTION: Clamp the trans-

ducer cable to transom near

the transducer. This will help

prevent the transducer from

entering the boat if it is

knocked off at high speed.

Good location

Poor angle

Poor location

Good

loc

a

tion

Transom

Tra

n

som

Hull bottom

Transducer

centerline

11

However, there are times when you may need to adjust the transducer

slightly higher or lower. The slots in the mounting brackets allow you

to loosen the screws and slide the transducer up or down. If you fre-

quently lose bottom signal lock while running at high speed the trans-

ducer may be coming out of the water as you cross waves or wakes.

Move the transducer a little lower to help prevent this.

If you cruise or fish around lots of structure and cover, your transducer

may be frequently kicking up from object strikes. If you wish, you may

move the transducer a little higher for more protection.

There are two extremes you should avoid. Never let the edge of the

mounting bracket extend below the bottom of the hull. Never let the

bottom – the face – of the transducer rise above the bottom of the hull.

Shoot-Thru-Hull vs. Transom Mounting

In a shoot-thru-hull installation, the transducer is bonded to the inside

of the hull with epoxy. The sonar "ping" signal actually passes through

the hull and into the water. This differs from a bolt-thru-hull installa-

tion (often called "thru-hull"). In that case, a hole is cut in the hull and

a specially designed transducer is mounted through the hull with a

threaded shaft and nut. This puts the transducer in direct contact with

the water.

Typically, shoot-thru-hull installations give excellent high speed opera-

tion and good to excellent depth capability. There is no possibility of

transducer damage from floating objects, as there is with a transom-

mounted transducer. A transducer mounted inside the hull can't be

knocked off when docking or loading on a trailer.

However, the shoot-thru-hull installation does have its drawbacks.

First, some loss of sensitivity does occur, even on the best hulls. This

varies from hull to hull, even from different installations on the same

hull. This is caused by differences in hull lay-up and construction.

Second, the transducer angle cannot be adjusted for the best fish arches

on your sonar display.

12

Lack of angle adjustment can be particularly troublesome on hulls that

sit with the bow high when at rest or at slow trolling speeds.

Third, a transducer CAN NOT shoot through wood and metal hulls.

Those hulls require either a transom mount or a thru-hull installation.

Fourth, if your Skimmer transducer has a built in temp sensor, it will

only show the temperature of the bilge, not the water surface temp.

Follow the testing procedures listed in the shoot-thru-hull installation

section at the end of this instruction booklet to determine if you can

satisfactorily shoot through the hull.

Transom Transducer Assembly and Mounting

The best way to install these transducers is to loosely assemble all of

the parts first, place the transducer's bracket against the transom and

see if you can move the transducer so that it's parallel with the ground.

The following instructions sometimes vary depending on the mounting

bracket that came with your transducer. Single frequency Skimmers

come with a one-piece stainless steel bracket, while dual frequency

Skimmers come with a two-piece plastic mounting bracket. Use the set

of instructions that fits your model.

1. Assembling the bracket.

A. One-piece bracket: Press the two small plastic ratchets into the sides

of the metal bracket as shown in the following illustration. Notice there are

letters molded into each ratchet. Place each ratchet into the bracket with

the letter "A" aligned with the dot stamped into the metal bracket. This po-

sition sets the transducer's coarse angle adjustment for a 14° transom. Most

outboard and stern-drive transoms have a 14° angle.

13

Align plastic ratchets in bracket.

B. Two-piece bracket: Locate the four plastic ratchets in the trans-

ducer's hardware package. Press two ratchets into the sides of the plastic

bracket and two on either side of the transducer as shown in the follow-

ing illustrations. Notice there are letters molded into each ratchet. Place

the ratchets into the bracket with the letter "A" aligned with the align-

ment mark molded into the bracket. Place the ratchets onto the trans-

ducer with the letter "A" aligned with the 12 o'clock position on the

transducer stem. These positions set the transducer's coarse angle ad-

justment for a 14° transom. Most outboard and stern-drive transoms

have a 14° angle.

Insert and align ratchets.

Dot

Alignment letters

Alignment

positions

Transducer

Trans

ducer

bracket

14

Add ratchets to bracket and transducer.

2. Aligning the transducer on the transom.

A. One-piece bracket: Slide the transducer between the two ratch-

ets. Temporarily slide the bolt though the transducer assembly and

hold it against the transom. Looking at the transducer from the side,

check to see if it will adjust so that its face is parallel to the ground.

If it does, then the "A" position is correct for your hull.

If the transducer's face isn't parallel with the ground, remove the

transducer and ratchets from the bracket. Place the ratchets into the

holes in the bracket with the letter "B" aligned with the dot stamped

in the bracket.

Reassemble the transducer and bracket and place them against the

transom. Again, check to see if you can move the transducer so it's par-

allel with the ground. If you can, then go to step 3A. If it doesn't, repeat

step 2A, but use a different alignment letter until you can place the

transducer on the transom correctly.

Transducer bracket

Ratchet

Transducer

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Eagle SeaFinder 640C DF User manual

Eagle SeaFinder 640C DF User manual

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